request polyline with precision of 5 or 6 positions (#3220)

include/engine/api/json_factory.hpp

@@ -42,9 +42,9 @@ std::string modeToString(const extractor::TravelMode mode);
 
 } // namespace detail
 
-template <typename ForwardIter> util::json::String makePolyline(ForwardIter begin, ForwardIter end)
+template <unsigned POLYLINE_PRECISION, typename ForwardIter> util::json::String makePolyline(ForwardIter begin, ForwardIter end)
 {
-    return {encodePolyline(begin, end)};
+    return {encodePolyline<POLYLINE_PRECISION>(begin, end)};
 }
 
 template <typename ForwardIter>

include/engine/api/route_api.hpp

@@ -68,7 +68,12 @@ class RouteAPI : public BaseAPI
     {
         if (parameters.geometries == RouteParameters::GeometriesType::Polyline)
         {
-            return json::makePolyline(begin, end);
+            return json::makePolyline<100000>(begin, end);
+        }
+
+        if (parameters.geometries == RouteParameters::GeometriesType::Polyline6)
+        {
+            return json::makePolyline<1000000>(begin, end);
         }
 
         BOOST_ASSERT(parameters.geometries == RouteParameters::GeometriesType::GeoJSON);
@@ -192,9 +197,17 @@ class RouteAPI : public BaseAPI
                     if (parameters.geometries == RouteParameters::GeometriesType::Polyline)
                     {
                         return static_cast<util::json::Value>(
-                            json::makePolyline(leg_geometry.locations.begin() + step.geometry_begin,
+                            json::makePolyline<100000>(leg_geometry.locations.begin() + step.geometry_begin,
                                                leg_geometry.locations.begin() + step.geometry_end));
                     }
+
+                    if (parameters.geometries == RouteParameters::GeometriesType::Polyline6)
+                    {
+                        return static_cast<util::json::Value>(
+                            json::makePolyline<1000000>(leg_geometry.locations.begin() + step.geometry_begin,
+                                               leg_geometry.locations.begin() + step.geometry_end));
+                    }
+
                     BOOST_ASSERT(parameters.geometries == RouteParameters::GeometriesType::GeoJSON);
                     return static_cast<util::json::Value>(json::makeGeoJSONGeometry(
                         leg_geometry.locations.begin() + step.geometry_begin,

include/engine/api/route_parameters.hpp

@@ -45,7 +45,7 @@ namespace api
  * Holds member attributes:
  *  - steps: return route step for each route leg
  *  - alternatives: tries to find alternative routes
- *  - geometries: route geometry encoded in Polyline or GeoJSON
+ *  - geometries: route geometry encoded in Polyline, Polyline6 or GeoJSON
  *  - overview: adds overview geometry either Full, Simplified (according to highest zoom level) or
  *              False (not at all)
  *  - continue_straight: enable or disable continue_straight (disabled by default)
@@ -58,6 +58,7 @@ struct RouteParameters : public BaseParameters
     enum class GeometriesType
     {
         Polyline,
+        Polyline6,
         GeoJSON
     };
     enum class OverviewType